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APM.MV_DCOST_SLOPE - APMonitor Option

Main.OptionApmMvDcostSlope History

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June 01, 2017, at 07:40 PM by 45.56.3.173 -
Changed lines 9-10 from:
 Description: Slope for penalization on future MV moves (i.e. reduces controller procrastination)
to:
 Description: Slope for penalization on future MV moves
             to reduce controller procrastination
June 01, 2017, at 07:40 PM by 45.56.3.173 -
Added lines 1-11:
(:title APM.MV_DCOST_SLOPE - APMonitor Option:)
(:keywords APM.MV_DCOST_SLOPE, Optimization, Estimation, Option, Configure, Default, Description:)
(:description Slope for penalization on future MV moves (i.e. reduces controller procrastination):)

%width=50px%Attach:apm.png

 Type: Floating Point, Input
 Default Value: 0.1
 Description: Slope for penalization on future MV moves (i.e. reduces controller procrastination)

MV_DCOST_SLOPE implements a linear increase in movement penalty (DCOST). The increase in DCOST favors near term movement in the manipulated variable. One issue with a deadband trajectory is a phenomena called controller procrastination where the optimal solution delays a move because it gives an equal objective function to wait one or more cycles. This causes the controller to be stuck in a state of inaction. Favoring movement on the first step of the controller avoids this delay in implementing the needed changes.